Well right now there is nothing to critic, as there is nothing but a picture and a very basic containment procedure.
Just to be sure, what do you mean by quarantine zone? Typically, personnels are quarantined after exiting an anomaly, so why are they quarantined before they enter?
Do you have an idea of what your SCP is going to be? Because it's usually easier to start with the description and then elaborate a containment procedure surrounding what you have created.

Because it's usually easier to start with the description and then elaborate a containment procedure surrounding what you have created.

This. You don't even have to have the description written out, just a good idea of what the SCP will be. Remember, the Procedures are reactionary in nature, and can only be defined by how the SCP operates.